Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 69
us used and connections. Ans. The regular telegraph key, a sounder, and relay areused with local battery and connected to any desired line byplugging in metal pegs at the standard telegraph switchboard.This is made of separated brass bar or strip in between whichare small brass discs connected… … ranted! SOUNDER RELAY
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
